On Tue, Apr 3, 2018 at 5:01 AM syzbot <syzbot+6956235342b7317ec564@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot hit the following crash on upstream commit > 86bbbebac1933e6e95e8234c4f7d220c5ddd38bc (Mon Apr 2 18:47:07 2018 +0000) > Merge branch 'ras-core-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=6956235342b7317ec564 > > So far this crash happened 4 times on upstream. > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6621340819783680 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=6075521074987008 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6447569127342080 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=6801295859785128502 > compiler: gcc (GCC) 7.1.1 20170620 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+6956235342b7317ec564@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. First crash: 323d, last: 12h23m https://syzkaller.appspot.com/bug?extid=6956235342b7317ec564 > ================================================================== > BUG: KASAN: use-after-free in __list_del_entry_valid+0x144/0x150 > lib/list_debug.c:54 > Read of size 8 at addr ffff8801d8dc7d20 by task syzkaller468166/4496 > > CPU: 0 PID: 4496 Comm: syzkaller468166 Not tainted 4.16.0+ #376 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x1a7/0x27d lib/dump_stack.c:53 > print_address_description+0x73/0x250 mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report+0x23c/0x360 mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > __list_del_entry_valid+0x144/0x150 lib/list_debug.c:54 > __list_del_entry include/linux/list.h:117 [inline] > list_del include/linux/list.h:125 [inline] > cma_cancel_listens drivers/infiniband/core/cma.c:1569 [inline] > cma_cancel_operation+0x455/0xd60 drivers/infiniband/core/cma.c:1597 > rdma_destroy_id+0xff/0xda0 drivers/infiniband/core/cma.c:1661 > ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1735 > __fput+0x327/0x7f0 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0x1ab/0x280 kernel/task_work.c:113 > exit_task_work include/linux/task_work.h:22 [inline] > do_exit+0x1986/0x2700 kernel/exit.c:865 > do_group_exit+0x149/0x400 kernel/exit.c:968 > get_signal+0x74c/0x16e0 kernel/signal.c:2469 > do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 > exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] > syscall_return_slowpath arch/x86/entry/common.c:265 [inline] > do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x446b09 > RSP: 002b:00007f2b89150da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: fffffffffffffe00 RBX: 00000000006e29fc RCX: 0000000000446b09 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006e29fc > RBP: 00000000006e29f8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472 > R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000005 > > Allocated by task 4493: > save_stack+0x43/0xd0 mm/kasan/kasan.c:447 > set_track mm/kasan/kasan.c:459 [inline] > kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 > kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3608 > kmalloc include/linux/slab.h:512 [inline] > kzalloc include/linux/slab.h:701 [inline] > rdma_create_id+0xd0/0x640 drivers/infiniband/core/cma.c:787 > ucma_create_id+0x35f/0x920 drivers/infiniband/core/ucma.c:480 > ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1656 > __vfs_write+0xef/0x970 fs/read_write.c:480 > vfs_write+0x189/0x510 fs/read_write.c:544 > SYSC_write fs/read_write.c:589 [inline] > SyS_write+0xef/0x220 fs/read_write.c:581 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > > Freed by task 4496: > save_stack+0x43/0xd0 mm/kasan/kasan.c:447 > set_track mm/kasan/kasan.c:459 [inline] > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 > __cache_free mm/slab.c:3486 [inline] > kfree+0xd9/0x260 mm/slab.c:3801 > rdma_destroy_id+0x821/0xda0 drivers/infiniband/core/cma.c:1691 > ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1735 > __fput+0x327/0x7f0 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0x1ab/0x280 kernel/task_work.c:113 > exit_task_work include/linux/task_work.h:22 [inline] > do_exit+0x1986/0x2700 kernel/exit.c:865 > do_group_exit+0x149/0x400 kernel/exit.c:968 > get_signal+0x74c/0x16e0 kernel/signal.c:2469 > do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 > exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] > syscall_return_slowpath arch/x86/entry/common.c:265 [inline] > do_syscall_64+0x6ec/0x940 arch/x86/entry/common.c:292 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > > The buggy address belongs to the object at ffff8801d8dc7b40 > which belongs to the cache kmalloc-1024 of size 1024 > The buggy address is located 480 bytes inside of > 1024-byte region [ffff8801d8dc7b40, ffff8801d8dc7f40) > The buggy address belongs to the page: > page:ffffea0007637180 count:1 mapcount:0 mapping:ffff8801d8dc6040 index:0x0 > compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffff8801d8dc6040 0000000000000000 0000000100000007 > raw: ffffea0007635ea0 ffff8801dac01848 ffff8801dac00ac0 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d8dc7c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801d8dc7c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff8801d8dc7d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8801d8dc7d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801d8dc7e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/94eb2c054604ad40010568e8ea21%40google.com. > For more options, visit https://groups.google.com/d/optout.
